This isn't going to work. An EL panel is effectively a capacitor: pulsed
DC will give you a brief flash of light as the capacitor charges, but after
that you'll get nothing. You could try putting a resistor across the panel
to discharge it between pulses, but it would be better to use an H-bridge
to get the required reversal of current flow, or a half-bridge switching
one side of the panel between +HV and -HV (with the other side groudned).
Jason Harper